Pulley-fastener.



W. D. MAYNARD. PULLEY PASTENER.

APPLIOATION FILED JUNE 13, 1910.

' 1,064,663. Patented June 10, 1913.

2 SHBETB-BHEET 1.

Eye.

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA c.

W. D. MAYNARD.

PULLEY FASTENER.

i APPLIOATION FILED JUNE 13, 1910. 1,064,663. Patented June 10, 1913.

2 SEEETS-SHEET 2.

l N VEN TOR.

BY w

COLUMBIA PLANOGRAFH CO..WASH1NG1'0N. n. c.

T NTTED %TATE% "PATENT @FFTCE WYLLYS D. MAYNABD, or 'UTICA, NEW YORK, ASSIGNOB or ONE-FOUETH TO LEAN F. SNYDER AND ONE-FOURTH 'ro CHARLES w. I-IILL, or' UTICA, NEW YORK.

PULLEY-FASTENER.

Application filed June 13, 1910.

To all wom iz may concern:

Be it known that I, lVYLLYs D. MAYNARD,

a citizen of the United States, residing in Utica, in the co unty of Oneida and State of New York, have nvented certain new and useful Improvements in Pulley-Fasteners, of which the following' is a specication.

To effectually secure a pulley to a shaft is not an easy matter to accomplish. In any event, it appears that such devices that exist in the prior art, tax the shaft to such an extent as to render the same, quite frequently, worthless.

An Object of the present improvement is to rely on the shaft and the pulley, equally 'for the atlixment of the latter to the former,

positively, at will, and to effect a release,`

the collar shown in Fig. 3, and likewise looking down onto the inside of said collar. Fig. 5 shows one half of a pulley mounted upon a shatt by means of the bashing and collars, illustrated in section. Fig. G is a side elevation of a pulley shown mounted upon a shatt by means of the bushing and collars.

In these Views, similar characters of reterence indcate Similar portions.

A bushing is formed of two Sections, 4, and 5, and this bushing surrounds the shatt 6. It may be stated, however, that, if desired, the bushing may constitute a unitary member which is split in coincidence with its elongated aXis, and in that way will serve the same purpose. The exterior of this bushing is provided with two sets of spirally-arranged members 7, and 8, progressing in opposite directions from the center of the bushing. This arrangement, however, obviously need not be so, for the same may be varied to meet mechanical demands. As may be observed, also, the exterior wall Specification of Letters Patent.

Patented J une 10,1913.

Serial No. 566,588.

of the bushing is tapered in opposite directions from the substantially central portion of the bushing, as may be seen in F ig. 2. Collars 9, 10, 11, and 12, are provided, and are formed with spirally-arranged grooves 13, and 14, to register with and coperate with the members 7, and 8, on the bushing. These four members are placed, centrally, upon the bushing, and a pulley, 20, slipped over the outer walls 15, and 16, thereof. These walls are intended to frictionally engage with the wall of the bore of the pulley, and therefore, as the latter is rotated, with respect to the shaft, there will at once be a separating movement of the collars 9, and 10, and 11, and 12, respectively, away from the center of the shaft bushing. This will be accomplished through the instrumentality of the spirally-located members or threads 7 and 8 in the bashing on the shaft. As this mo-vement takes place, the collars 9, 10, 11, and 12, will force their way along the tapered surface of the shaft bashing, and naturally spreading apart will more efiectually impinge or grip the interior wall of the bore of the pulley. At the same time, this operation will cause the sha'ft bushing to more elfectually hug the shaft, when it will be observed there is a dual grip upon the shat't and the interior wall of the bore of the pulley, which will hold the latter and the former unmovable, relatively, at will. This will also remain so as long as the rotation of the pulley and the shaft, relatively, are in the same direction. When it is desired to`release the pulley 'from the shatt, the forcing of the shaft and the pulley in opposite directions will efiect an automatic release without impairing the usefulness of any of the elements.

Having thus described this invention, I claim:

1. In a pulley fastener, the combinaton with a shat't of a member to be keyed thereto, a bushing comprising two Sections and having spirally arranged members mounted on said shaft, said sections formed to taper in opposite longitudinal directons from the central portion of said bushing, split collars having spiral grooves, mounted on said bushing, said grooves adapted to conform to the contour of said spiral members on said bushing, whereby the turning of said shaft will cause said collars to move in opposite directions longitudinally on said bushing and thereby cause said collars to eX- pand to seeure the member to said shaft.

,2. In a pulley fastener of the eharacter descrbed, the combination With a shaft of a member to be secured thereto, a bushing comprising two Sections and having spraliy arranged members formed thereon, said sections formed to taper in opposte longitudinal directions from the Central portion of* said bushing, split collars having` spiral" grooves formed t herein, mounted on said bushing, said grooves adapted to conform to the contour of said spiral members on said bushng, Whereby the turning of said shaft Will cause said oollars to expand 'to secure the member to said shaft.

3. In a pulley fastener, the combination with a sha'ft of a member to be keyed thereto, a bushing mounted on said shaft, said bushing eomprising two sections and having sprally arranged members formed thereon, said members progressing in opposite longitudinal directions from the. cent-rai portion of said bushing, and split collars having spiral grooves, mounted on said bushing, Said grooves adapted to conform to the contour of said spral members on said bushing, Whereby the turning of said' shaft will cause said collars to eXpand' to secure the pulley to a shaft.

4. In a. pulley fastener, the combination With a shaft of a member to be keyed thereto, a split bushing mounted on said shaft, said bushing having ends tapering inwardly toward its centralportion and spiral members arranged thereon, split collars having spiral grooves, mounted on said bushing,

VVYLLYS D. MAYNARD.

\Vitnesses z FRED'VV. BARN-ACLO, JAMES R. DOWN.

Gop'ies of this patent may b:: obtained for five cents each, by addressing the Commssoner of Patenti. Washington, D. C. 

